[Bldg-sim] OT fresh air
Chris Jones
cj at enersave.ca
Tue Mar 5 09:23:56 PST 2013
This is a timely subject. I have been working on
some very large distribution warehouses. The
staff are never all in one place at one time
except morning, breaks and the end off
shift. The local authorities are asking that
ASHRAE 62.1 be followed - warehouses at 0.06
cfm/sf. A half million square foot warehouse
ends up with a lot of out door air that needs to
be conditioned, especially in summer to remove
the latent load. I went through the Handbook of
Applications and the Industrial Ventilation
reference manual but found no guidance that would
allow the OA to be lower than that value.
When one considers that over 3/4 of that space is
solid from floor to ceiling with the stacks of
crates, boxes etc. it seems a very large amount
of outdoor air for the floor space that is no "solid".
Does anyone have experience with this sort of
facility and reducing outdoor air levels below that 0.06 cfm/sf.
At 11:20 AM 04/03/2013, David Eldridge wrote:
>Content-Language: en-US
>Content-Type: multipart/alternative;
>
>boundary="_000_C3ACED7A6ED5C6408CC43B138390EB8633F9DE60CH1PRD0611MB408_"
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>You should check with the design team to see
>what the governing codes are from the local
>authorities. In terms of ASHRAE references, 2011
>Handbook of Applications Chapter 8 or Standard
>170 will take precedence over ASHRAE 62.1, since
>the criteria in this case is for infection
>control purposes which goes beyond the comfort
>requirements in 62.1. There are a number of
>other references that the design team might be
>using. These might include the clientâs own
>design standards which may be even higher than the regulatory requirements.
>
>Regarding your prior post about the reheat it
>will be a significant quantity, this is
>ttypical. However for reheat to be higher than
>the cooling end-use during a peak summer month
>should be reviewed. Assuming your location has
>economizer hours in the winter, the reheat could
>easily be higher than the cooling on an annual
>basis unless the design is including measures to reduce the need for reheat.
>
>David
>
>
>
>
>David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP
>Grumman/Butkus Associates
>
>
>
>
>From: bldg-sim-bounces at lists.onebuilding.org
>[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Sambhav Tiwari
>Sent: Monday, March 04, 2013 3:52 AM
>To: bldg-sim
>Subject: [Bldg-sim] OT fresh air
>
>Hi All,
> Is there any ACPH recommende value
> for operation theatre given in ASHRAE
> 62 standards It is 100% fresh air AHU . but
> the cfm sized is very high 6cfm/sqft as per
> design and if i reduce it to 3cfm/sqft i am
> still not getting any discomfort hour.
>
>Thanks
>Sambhav.
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Christopher Jones, P.Eng.
Suite 1801, 1 Yonge Street
Toronto, ON M5E1W7
Tel. 416-203-7465
Fax. 416-946-1005
email cj at enersave.ca
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